Rotary motor.



H. B. HOLT.

ROTARY MOTOR.

APPLICATION nun 12.4, 1912.

Patented Dec. 24, 1912.

, To all whom it may concern:

UNITED STATES HARRIS B. HOLT, OF PITTSBURGH, PENNSYLVANIA.

ROTARY MOTOR.

Specification of Letters Patent.

Patented Dec. 24, 1912.

Application filed April 4, 1912. Serial No. 688,384.

Be it known that I, HARRIS B. HOLT, residing at Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, a citizen of the UnitedStates, have invented or discovered certain new and useful Improvementsin Rotary Motors, of which improvement the followin is a specification.

My invention re ates to rotary motors, and particularly to such motorsas are used to rotate cutters for cleaning the scale from the interiorof boiler tubes.

The object of my invention is to provide a rotary motor comprising aminimum number of parts so arranged that access may be had totheinterior of the motor both from the inlet and the outlet ends thereof.

A further object of my invention is to so construct such a motor thatthe several parts thereof need not. be adjusted to, and held in,predetermined relative positions. 1

My invention is illustrated in the accompanying drawing, which formspart of my specifieatiomand in whicha Figure 1 is a longitudinalsectional view of a rotary motor, the plane of section being takenthrough the axis thereof; Figs. 2, 3 and 4 are transverse sectionalviews taken, respectively, on the lines II-'II; IIIIII and IVIV, Fig. 1;and Fig. 5 is an end View of the outlet end of the motor.

In the several figures like numerals are used to designate like parts.

The essential parts of my improved motor are, as shown particularly inFig. 1, an inlet head 1, an outlet head 2, a rotary shaft 3, and acasing 4, 5. The inlet head 1 may be suitably secured to one end of thecasing 4, 5, which casing is provided with an eccentrically-disposedcylindrical chamber 6,

adapted to operatively receive the bladeprovided rotary shaft 3; and theoutlet head 2 may be suitably secured to opposite end of the saidcasing. I will first describe the preferred construction of each of thesaid several essential parts of my improved motor, and thereafter I willdescribe the operation of the motor as a whole.

The, inlet head 1 is preferably cylindrical in form and'is provided witha central opening; and secured to one end thereof is shown ascreen-carrying member 7, which in turn may be secured to a suitablecompressed air conduit, not shown. In the opposite end of the said heada suitable shaftreceiving bushing 8 may be firmly secured by expandingthe bushing into tight engagementwith the said head. The said bushing 8is provided with a flange 9 forming with the walls of the head anannular chamber 10, having communication with the inlet orifice of thesaid head, preferably by means of a plurality of ports 11; also. thesaid bushing-flange 9 forms a closure for the fluid containing portionof the chamber 6.

The outlet head 2 is preferably similar in its eneral construction tothe inlet head descri ed above, the bushing 12 forming with the walls ofthe said head 2 an annular chamber'13, and the bushing flange 14affording a closure for the opposite end of the chamber 6. An escape ofthe fluid from the annular chamber 13 may be had through a plurality ofoutlet ports 15.

The'rotary shaft 3, preferably ofan integral structure throughout,consists of hearing portions 3 and 3", which are rotatably sustained inthe bushings 8 and 12, respectively, and an enlarged portion 3,extending throughout the length of the chamber 6. The bushing-flanges 9and 14 fit neatly against the ends of the enlarged portion 3 of theshaft and prevent any longitudinal movement thereof. Also the portion 3is suitably slottedto receive the reciprocating blades, and as shownherein two such blades 16 and 17 maybe placed at right angles to eachother, the blade 16 being a double or split blade, such a constructionbeing well known to those skilled in the art.

The casing 4, 5 is preferably made in two parts, a cylindrical sleeve 4,to the opposite end of which the said heads 1 and 2 may be secured byscrew-threads, and a drum 5. As stated above, the drum 5 is providedwith an eccentrically-disposed cylindrical chamber 6, within whichchamber the enlarged shaft portion 3 rotates. The shaft portion 3 ismaterially smaller in diameter than the chamber 6, and the said shaft ismounted so as to be substantially in contact with the wall'of the saidchamber, as particularly shown in Figs. 3 and 4.

Suitable fluid passageways are provided to the end that there may beopen communication between the annular chambers 10 and 13 and the shaftoperating chamber 6. I preferably form on the left end of the drum acrescent-shaped chamber 18, which, -as will be readily seen will be inconstant communication with the annular chamber 10 at all relativepositions of the head 1 and such ports affording constant communicationbetween the chambers 18 and 6. Similarly, on the right end of the drum,a cres- 16 and 17, becomes effective to rotate the.

cent-shaped chamber 20 may be formed, having constant communication withthe annular chamber 13, and communicating with the chamber 6 by means ofthe port 21.

In order to procure a tighter fit between the drum 5 and the sleeve 4,and thereby reduce to a minimum the possibility of fluid escaping aroundthe drum from the chamber 18 to the chamber 20, I provide the said drum5 and sleeve 4 with cooperating shoulders 22.

In assembling the several parts of my improved motor 1nto an operativestructure, the blade-provided shaft 3 may be placed in the drum 5, whichmay be placed within the sleeve 4:- The bushing-provided inlet andoutlet heads may then be secured to the sleeve 4, the said heads beingscrewed thereon until the bushing flanges 9 and 14 bear tightly againstthe left and right ends, respectively, of the said drum. Andin suchposition the shoulders 22 will be brought'to engagement with each other,thus reducing the possibility of leaking between the sleeve and theouter cylinder wall.

In the operation of the motor, a fluid under pressure, such ascompressed air passes successively through the ports 11, annular chamber10, crescent-shaped chamber 18, and ports 19 to the cylindrical chamber6, wherein the fluid, acting against the blades shaft 3. The spent fluidescapes from the chamber 6 by passing successively throughthe port 21,crescent-shaped chamber 20, annular chamber 13 and ports 15, the fluidthen becoming effective when the motor is used to drive a boiler-tubecleaner, to drive the chipped oif scale through the tube ahead of themotor.

It will be observed of this construction that, on account of theparticular arrangement of passageways for the fluid, it is unnecessaryto adjust the inlet and outlet heads to' specific predeterminedpositions with relation to the cylinder 4, 5. And

it will also be seen that no pins or other securing members are requiredto unite the several parts.

I claim as my invention:

1. In a rotary motor, the combination of a casing provided with aneccentric cylindrical chamber having'inlet and outlet ports through thewalls thereof, and a blade-provided shaft within said'chamber; of a headremovably secured to said casing and having fluid passagewaytherethrough, and an extended annular chamber affording communicationbetween one of said ports in the wall of said cylindrical casing andsaid fluid passageway at all relative positions of said removable headand casing, substantially as described. a

2 In a rotary motor, the combination with a, casing having a cylindricalchamber therein, and a blade-provided shaft eccentrically disposedwithin the said chamber; of inlet and outlet heads secured to the saidcasing and each provided with annular chambers afi'ording constantcommunications with the said inlet and outlet ports of said cylindricalchambers in all relative positions of the said casing and heads,substantially as described.

3. In a rotary motor, the combination with a blade-provided shaft; of a'drum provided at opposite ends with crescentshaped chambers and alsoprovided with an eccentric longitudinal cylindrical chamber having portscommunicating with the said crescent-shaped chambers, a sleevesurrounding said drum, and port-provided inlet and outlet heads securedto the said sleeve, the ports of said inlet and outlet'heads being incommunication with said crescent shaped chambers at all relativepositions of said heads and easing, substantially as described.

4. In a rotary motor, the combination of a casing consisting of a drumand a sleeve each having cooperating engaging shoulders, ablade-provided shaft within an eccentric cylindrical chamber of the saiddrum, and a head having screw-thread attachment to the said sleeve andhaving a bushing provided with a flange adjacent to and bearing againstone end of the said drum, whereby a tightenin of said head upon saidsleeve becomes e ective' to bring said. coiiperating shoulders intoleakage preventing engagement, substantially as described.

5. In a rotary motor, the combination of a casing provided with acylindrical chamber extending through it from end to end and with acrescent-shaped inlet chamber surrounding the first-named chamber at theend thereof, a port being provided between the two said chambers, ablade-provided shaft extending through said first-named chamberconcentric with the outer wall of said inlet chamber, a headscrew-threaded upon said casing, and a block affording a journal forsaid shaft and a closure for said chambers, said block provided with acircumferentially-extended passageway affording communication with saidinlet chamber.

6. In a rotary motor, thecombination of a casing provided with acylindrical chamber extending through it from end to end and wit-hcrescent-shaped inlet and outlet chambers surrounding the first-namedchamber at the end thereof, ports being provided between saidfirst-named chamber and said terminal crescent-shaped chambers, abladeprovided shaft arranged within said first- 130 named chambereccentric to that chamber casing affording communication to the said 10but concentric with the outer walls of said crescent-shaped chamber.

crescent-shaped terminal chambers, jour- In testimony whereof I havehereunto set nal blocks for said shaft and forming heads my hand.

for the said several chambers and a passageway through each of saidjournal HARRIS HOLT blocks, such passageway extending circum- Witnesses:

. ferentially with respect to the journal axis PAUL N. CRITCHLOW,

and in all relative positions of block and FRANCIS J. TOMASSON.

